I know that Ali Hari Krishna was kind enough to share what they developed - Custom Object Button for <Previous and Next> Tab set
So, I thought I'd post my version.
In the environment I support, we generally have a "record information" section that contains helper fields etc. And is generally placed at the bottom of the form and collapsed by default.
Next, within each of the tabs, I created a custom object that contains the html that's also attached in the word doc.
Sharing my version of the Toggle Tab Controls.
Below is a snapshot of my buttons. They're a little "old" so they may need some "renovation" to make them a look a little more current.
I guess this is to your preference, but I personally liked the look of Ali's better than what I created.